PHILADELPHIA (CBS) — Dozens of artists have set up tents on Rittenhouse Square for a craft fair that runs through the weekend.

Paul Yacoe makes puzzle boxes out of exotic wood. They come in all kinds of shapes — everything from hearts to guitars.

He says it takes a little thought to get them open.

“You lift the little key or lock out, slide the top, lift the little inner lid, and then you’re in the box. And in this particular one it has a little shelf in it so you can lift that and see the bottom part of it.”

(Paul Yacoe demonstrates the intricacy of his carved wooden boxes, this one in the shape of a butterfly. Credit: Paul Kurtz)

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Chelsea Fair (below) is a glassblower.

“These are done with glass color that we crush up to the consistency of powder,” she says, “and then we sift it on. And then we’ll blow it and shape it.”